Infineon Technologies AG is supplying silicon carbide power semiconductors to Fox ESS for residential energy storage systems. The focus is on CoolSiC MOSFET1. metal-oxide semiconductor field effect transistorVoltage-controlled field-effect transistor with an insulated gate, widely used in integrated circuits.2. metal-oxide-semiconductor field-effect transistorA common transistor type used here as the layout and technology reference.s 1200 V G2 in the Q-DPAK package, which Fox ESS uses in its PQ3-Ultra system to raise conversion efficiency at system level.
According to the companies, the SiCsilicon carbideSiC is one of the power semiconductor materials being assigned a distinct role in the power delivery chain. devices cut switching losses by 70 percent. In grid-tied operation, the PQ3-Ultra reaches a peak photovoltaic inverter efficiency of up to 98.78 percent, while peak battery charge and discharge efficiency is reported at up to 98.47 percent. Infineon says the combination of SiCsilicon carbideSiC is one of the power semiconductor materials being assigned a distinct role in the power delivery chain. and the Q-DPAK package is intended to improve efficiency, thermal performance and design flexibility in residential ESS platforms.
The package and device architecture are central to the claim. The top-side-cooled Q-DPAK is described as supporting better thermal management, a compact footprint and lower parasitic effects through improved PCBprinted circuit boardBoard that mechanically supports components and electrically interconnects them with copper traces. layout. Infineon also points to its .XT interconnection technology, which reduces thermal resistance and operating junction temperature, while the trench gate structure helps lower switching losses.
Fox ESS says the package compatibility with automated assembly can simplify scalable manufacturing. In a recent test by HTW Berlin University of Applied Sciences and AQUU Research, the company also reported a System Performance Index of 97.0 percent for a hybrid ESS solution combining the PQ-H3-Ultra-10.0 inverter with the EQ3300-5 battery. That result placed Fox ESS first in the 10 kW class among the systems tested in 2026.
Fox ESS has installed more than 890,000 PVprocess vacuum inverters and over 1 million batteries in more than 70 countries over the past three years. The collaboration between Infineon and Fox ESS centers on making residential storage systems more efficient and reliable through SiCsilicon carbideSiC is one of the power semiconductor materials being assigned a distinct role in the power delivery chain.-based power conversion.